Plate holder for taking rontgen photographs



Mar. 27 1923.

G. BUCKY. PLATE HOLDER FOR TAKING RC'YNTGEN PHOTOGRAPHS.

FILED JAN. 20, 1'92!- 'the patient that is to Patented Mar. 27, 1923.

UNITED STATES GUSTAV BUCKY, OF BERLIN, GERMANY.

Application filed January 20, 1921.

To all whom it may concern Be it known that I, GUSTAV BUCKY, residing at Kleiststr. 19, Berlin W, Germany, have invented certain new and useful Improvements in Plate Holders for Taking Rontgen Photographs, of which the following is a specification.

This invention relates to improvements in plate-holders for the taking of Rontgen photographs, in which the sensitive plate is arranged in a frame upon a plate which is pervious to Rontgen rays but impervious tolight and upon which is laid the part of be photographed by means of Rontgen rays, whilst a cover that is impervious to rays and that is also arranged in the said frame is placed above the sensitive plate and held in position by locking members.

In known arrangements of this kind the external plate or sheet that is attached to the frame of the plate-holder and upon which the particular part of the patients body that is to be irradiated by Rontgen rays is placed is generally made of black cardboard. This involves two disadvantages. In the first place such a plate-holder is not consistent with the simplest rules of hygienics because the cardboard surface of the plate-holder cannot be cleaned, although several patients come into contact with it in succession, so that all manners of unclean or contagious matter may be transferred to or by it. Secondly, cardboard is hygroscopic and becomes warped in moist weather which causes much trouble when intensifying foils or sheets are used that are interposed between the cardboard sheet and the sensitive plate and do not lie smoothly against the same when the said sheet is warped.

Another disa dvantage of the known plate holder is that the fixing of the cover is accomplished by means of a large number of individual locking members or hinged clamping devices the handling of which causes much loss of time and which are very liable to become unlocked of themselves. The known form of cover also involves the use of a spring or springs for exerting a pressure upon the sensitive plate and these springs are liable to frequent breakage.

The object of this invention is to produce a device which, whilst it is simple and cheap, conforms in every respect with the rules of hygienics. The external plate or sheet of PLATE HOLDER FOR TAKING RGNTGEN PHOTOGRAPHS.

Serial No. 438,788.

the plate-holder that is brought into contact with the patient consists of a non-hygroscopic substance that can be easily washed and which, whilst it is impervious to light, allows Rontgen rays to pass through it.

One specific feature of the invention consists in the manner in which this external plate or sheet is fixed to the frame of the plate-holder.

Another feature of the invention resides in the manner of fixing the cover of the plate-holder in the frame of the same by a device which enables the cover to be locked in position or unlocked by a single motion of the hand.

And finally the invention provides an arrangement by which the cover of the plate holder is pressed against the sensitive plate without the aid of springs by the effect of the fixing or locking device.

A constructional form of theinvention is shown in the drawing in which- Fig. 1 is a vertical longitudinal section of the plate-holder, with its cover removed, on the line I-I of Fig. 3,

Fig. 2 is a plan view of the plate-holder, Fig. 8 is a horizontal section of the cover of the plateholder on the line IIII of Fig. l and Fig. 4 is a vertical section on the line III-III of Fig. 3.

The plate-holder consists chiefly of a metal frame 1, an external or base plate or sheet 2. and a cover 3. The frame, which is preferably made of metal, has rounded outer edges. The external plate 2 consists of a substance such as celluloid, cellon (incombustible cellulate substance) hard-rubber or the like. This plate is impervious to light and preferably black all through, and perfectly smooth, especially on the outside, so that it may be easily washed. The plate 2 is fixed by its margins being the rounded outer sides of the frame 1 and turned down onto its top surface and fixed there by means of metal strips 4 which, with the aid of screws 5, press the margins and edges 6 of the plate 2 against the frame 1.

In this way the plate 2 is pulled quite taut and the tautening tension can be enhanced by the sheet of cellon or the like being caused to expand by heating and being screwed fast to the frame in its heated state.

The cover 3 of the plate-holder consists chiefly of a frame 7 having an aluminium plate 8 screwed fast to its upper side and bent up around margin, may also a second metal plate 9 fixed, by screws to its lower side. Beneath the plate 9 is a lead plate 10 which, when the cover is put .into position, contacts with the sensitive plate 11 indicated by a broken line in Fig.1.

Resting upon the plate-9 area-number of looking members 12. These are guided at their one end in slotsl3in the, frame 7 and. their other ends 14 are circular and fit into notches of a corresponding shape in a disc 15. The circular ends 14: are kept in their slot'svby a covervplate 21in a manner hereinafter more .fullydescribed. The outer end portions of the locking members 12 are thicker from top to bottom than their stems and their end surfaces 16 areinclined. The downwardly projecting portions. at the outer ends of the stems of the locking'members engage withslotsl? in the.platei9.- The said outer ends are adapted to enter the four cornered holes 18- in the frame 1. The end surfaces of the locking .members are inclined. in such. a way that,'on their entering the holes 18, they press the coverM3 downwards. i

The disc 15, is arranged to be turned on a pivot 19 and fixed upon this pivot by means of a screw 20-is the; aforesaid coverplate 21 whose circular margin 22 is bent upwards. This co ver-plate fits into a hole in the upper plate 8 of the cover and forms a cavity in which the handle 23 is arranged. This handle is pivotally attached to two lugs24 which are punched up out ofthe dish/'15 and extend upwardly through slots 25 in the cover plate2l. The shape of the handle 23 is such' that when it is folded down it sinks completely into the cavity formed by the cover plate 21, The handle when turned operates to-move the locking members l2-land tothereby lock or unlock the cover 3 of theplate-holder in its frame 1.- According to the amount of turning movenientimparted to the handle 23- the locking 'members are moved more or less into the holes 18 in the frame so that their inclinedend surfaces 16- press the cover downwards against the sensitive plate 11. A yielding contacting surfaceis presented to the margin of the cover inthe shape of a felt strip 26 which is fastened upon a ledge at the inner border of the frame -1. The inner edges of the strips 4: by which the sheet of cellon 2' is fixed act as guiding'mernbers or lateral abutments for the upper platef8 of the coVerB. The plate 8, in addition to being fixed by screws at its be; connected to the lower plate 9 byj'screws 27 arranged around the middlelhole in the ing passed through smallsleeves 28" that keep the two plates 8 and 9 at the proper s ance-ma t It will be obvious that many changes and modificatipns can made without departing from the scope of myinvention.

I clairng- 1. A plate-holder for taking Rontgen photographs comprising, a frame, a sheet consisting 'of an opaque cellulate. substance stretched at .oneside of theiframe and having its margins turned aroundthe edges of the frame, inthe frame at its other. side, and a locking device for locking the cover in position in. the frame. if

2. A plate-holder. for taking Rtintgen photographs comprising, a metal frame, Ia sheet of vcellulate substance stretched at one side of the frame and having its margins, turned around the edges of theframe andplate 8, these screws bea cover adaptedlto be inserted passed to\its other .side, holding means for: holding thecellulate sheet, a cover adapted to betinsertediin the said frame, the said holding means being adapted to guidethe said: covenand locking means forlocking the cover in position in the .a frame.

8. A plateholder for. taking Riintgen photographs comprising, a frame, a sheet ofcellulate substance stretchedv atione side of the a said frame and having. its margins turned around the edges. of the frame and passed to its. other side, a cover adapted to be inserted in .theaframe, screws, strips heldaby the screws at the other side of. the frame, and adapted to .formilateral guiding members for. the cover, and lookingdevices-for lockingthe. cover in positi on in the frame.

4L. -A plate-holder formtaking Rhntgen photographs comprising; a frame a washa-- ble, ,,opaq1ie sheet atone side of the frame; cavities infthe innerv edges. of the frame; a cover adapted to be inserted in the frame at its other side a depressioniin the cover a plurality of locking bolts with outer ends adapted to engage with :the said cavities;

guide members for guiding thesaid bolts; a turnable disc linked to the inner ends-of the said bolts and a handle hinged to the saiddiscand adapted to be folded downinto the said vdepression.

In-testimony whereof I have signed this specification in the presenceoftwo witnesses.

i GUSTAV BUCKY. Witnesses:

URsULAv MEYERHOFFER, ERNSTFULD. 

